Mechanical movement



1952 P. e. MANGOS 2,619,

' MECHANICAL MOVEMENT Filed May 1, 1950 IN VEN TOR. PETER G. MANGOS ATTORNEY Patentecl Nov. 25, 1952 UNITED STATES PATENT OFFICE MECHANICAL MOVEMENT Peter G. Mangos, Minneapolis, Minn.

Application May 1, 1950, Serial No. 159,325

6 Claims. (Cl. 185-37) My invention relates to improvements in mechanical movements.

The object of this invention is to provide a mechanical movement for use in imparting reverse rotary movement to a member in which the speed in one direction is greatly increased over that in the opposite direction.

To the above end, the invention consists of the novel devices and combination of devices hereinafter described and defined in the claims.

In the accompanying drawing, which illustrates the invention, like characters indicate like parts throughout the several views.

Referring to the drawing:

Fig. l is a view of the invention principally in central vertical section;

Fig. 2 is a sectional view taken centrally and vertically through the right-hand piston, shown in Fig. 1, on an enlarged scale;

Figs. 3 and 4 are elevational views of one of the cable guides and the port-equipped partition removed from the device, on the same scale as Fig. 2; and

Fig. 5 is a detail view principally in section taken substantially on the irregular line 5-5 of Fig. 4.

The numeral 6 indicatees a housing having a semi-circular bottom member 1, a displaceable cover member 8, and leg brackets 9.

Within the housing 6 is a U-shaped cylinder Hi, the transverse portion of which is semi-circular and comprises a plurality of segments These segments H, at their ends, and the side members l2 and I3 of the cylinder II], at their lower ends, have outturned annular flanges l4. Adjacent pairs of flanges I4 are connected by a plurality of nut-equipped bolts 15. A screw cap I6 is applied to the upper end of each cylinder side member |2|3. The cylinder I0 is detachably secured to the housing 6 by upper and lower pairs of overlapping lugs |l connected by nutequipped bolts l8.

A pair of pistons |9-20 is mounted in the cylinder side members |2|3, respectively. At the longitudinal center of the cylinder segments is a transverse partition 2|. The cylinder Ill between the pistons |9-20 is filled with a fluid a: which is poured into said cylinder through a filling opening 22 in the head of the piston |9. This filling opening 22' is normally closed by a screw plug 23, see Fig. 2.

The pistons |92l3 are connected by a cable 24 for common raisin and lowering movements. The end portions of the cable 24 extend upwardly through the pistons |920 at their axes and are arranged to be reversely wound on a shaft 25 journaled in bearings 26 on the side members of the housing 6 above the piston H]. The cable 24, between the pistons |9-29, extends through spiders 21 and over depending guides 28. These spiders 2'! are in the form of flat disks interposed between the flanges |4 on the lower ends of the cylinder side members |2-|3, and the upper ends of the uppermost cylinder segments H and secured thereto by the respective bolts IS.

The cable 24 is further guided, between the pistons I9-29, by a guide sheave 29 journaled on the partition 2| and a pair of guide sheaves 39 journaled on a pair of spiders 3| between the partition 2| and the spiders 21. The partition 2| and the spiders 3| are interposed between the remaining pairs of flanges 4 and are secured thereto by the respective bolts l5. Both pistons |920 are secured to the cable 24 in the same manner, but shown only in the piston I9. Secured to and within the lower end portion of the piston I9 is a spider 32. This spider 32 and the head of the piston l9 have aligned axial holes through which the cable 24 extends. A pair of clips 33 applied to the cable 24 within the piston I9 impinge sides of the head of the piston l9 and the spider 32 and connect said piston to the cable 24.

Formed in the partition 2| is a port 34 having a relatively large fluid-conducting capacity.

This port 34 is normally closed by a valve 35 in the form of a disk, which closes on the side of the partition 2| toward the piston I9. The valve 35 is slidably mounted on three circumferentially spaced headed screws 36 which have threaded engagement with the partitions 2| A coiled spring 3'! encircles each screw 36 and is compressed between the heads of said screws and the valve 35 and yieldingly hold said valve closed.

Obviously, movement of the fluid a: by downward movement of the piston 20 will open the valve 35. An open port 34' in the partition has a relatively small fluid-conducting capacity.

An upper bar 38 and a lower bar 39 extend between the cylinder side members l2 and I3 and are rigidly secured thereto. A pair of posts 40 extend between the bars 38-39 and are rigidly secured thereto. A spring base 4| in the form of a horizontal bar has in its end portions holes through which the posts 40 loosely extend. A coiled spring 42 encircles each post 49, is compressed between the upper bar 38 and the spring base 4| and yieldingly holds said spring base 4| on the lower bar 39. The spring base 4| is attached to the shaft 25 by a cable 43 and ar- 3 ranged to be wound thereon to lift said spring base.

One end of the shaft extends outwardly of the housing 6 and is equipped with a large wide pulley 44. A cable 45 has one of its ends secured to the pulley 44 to be wound thereon. An elevator platform 46 is attached to the other or lower end of the cable 45.

Normally, the pistons l9-20 are as shown and the spring 42 yieldingly holds the shaft rotated into a position in which the cable 43 is wound on the pulley 44 and holds the elevator platform 46 raised. The raising and lowering of the elevator platform 46 is controlled by the ports 34--34' and the valve 35.

When a load of sufficient weight to overcome the spring 42 is placed on the elevator platform 46, when raised, said platform will move downwardly, unwind the cable 45 therefrom and rotate the pulley 44 and the shaft 25. Rotation of the During the downward movement of the elevator platform 45, the rotation of the shaft 25 will wind the cable 43 thereon, raise the spring base 4| and compress the springs 42 and place the same under tension.

When the load is removed from the elevator platform 45, the tensioned springs will force the spring base iii downwardly and the pull on the attached cable 43 will unwind said cable and thereby rotate the shaft 25 in a direction to wind the end portion of the cable 24 leading from the piston 59 and lift said piston. This lifting of the piston 19 will pull the piston 29 down and thereby force the :c to open the valve and flow through the two port 34 and 34' and thus cause the elevator platform 45 to move upwardly very fast in comparison with the downward movement thereof.

What I claim is:

1. In a device of the class described, a cylinder, a pair of pistons in the cylinder, a transverse partition in the cylinder between the pistons, a fluid in the cylinder between the pistons, a port in the partition having a relatively large fluidconducting capacity, a valve normally closing the port, said valve being constructed and arranged to be opened by pressure of the fluid produced by the lower one of the pistons and held closed by pressure of the fluid produced by the lowering of the other piston, an open port in the partition having a relatively small fluid-conducting ca pacity, and means for alternately and successively raising and lowering the pistons in which they move relatively fast, when the valve is open and the fluid is being forced through the two ports by the piston on the opening side of the valve, and move relatively slow when the valve is closed and the fluid is being forced through the open port, by the piston on the closing side of the valve, said cylinder being U-shaped, the transverse member thereof being semi-circular, and the pistons being one in each of the side members of the cylinder.

2. The structure defined in claim 1 further including a cable in the cylinder extending through the partition and connecting the pis- 4 tons, and means in the cylinder for guiding the cable.

3. The structure defined in claim 1 in which the cylinder is U-shaped, the transverse member thereof is semi-circular and the pistons are one in each side member of the cylinder, said structure further including a cable in the cylinder extending through the partition and connecting the pistons, and radial spiders in the semi-circular portion of the cylinder and having guides for the cable.

4. In a device of the class described, a U- shaped cylinder having a central transverse partition, a pair of pistons in the cylinder, one on each side of the partition, one of the pistons being raised and the other lowered, a shaft overlying the cylinder, a cable extending through the cylinder and connecting the pistons for common movement, the end portions of the cable being attached to the shaft and arranged to be reversely and alternately wound and unwound thereon, a fluid in the cylinder between the pistons, a port in the partition having. a relatively large fluid-conducting capacity, a yieldingly closed valve normally closing the port, said valve being constructed and arranged to be opened by pressure of the fluid produced by the lowering of one of the pistons and held closed by pressure of the fluid produced by the lowering of the other piston, an open port in the partition having a relatively small fluid-conducting capacity, spring means normally holding the shaft with the piston on the closing side of the valve raised and the other piston lowered, a sheave on the shaft, and a load-carrying cable arranged to be wound on the sheave by rotation thereof by the spring means to lower the piston on the opening side of the valve and the raising of the other piston, when a load of sufficient weight is attached to and held suspended by the load-carrying cable to overcome the tension of the spring means it will be lowered by the unwinding of the load-carrying means, the lowering of the weight rotating the shaft to lower the raised pinion and raise the lowered pinion and place the spring means under tension.

5. The structure defined in claim 4, further including means for guiding the first-noted cable between the pistons.

63. The structure defined in claim 4 in which the transverse portion of the cylinder is semicircular, and further including radial spiders in the cylinder having means for guiding the firstnoted cable between the pistons.

PETER G. MANGOS.

CES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 100,449 Roberts Mar. 1, 1870 396,108 Nickerson Jan. 15, 1889 1,273,059 Hild July 16, 1918 1,442,540 Ross Jan. 16, 1923 1,756,910 Fuller Apr. 29, 1930 2,141,541 Levy Dec. 27, 1938 2,385,946 Schorer Oct. 2, 1945 FOREIGN PATENTS Number Country Date 31,662 France Mar. 21, 1927' 

